Hello,
I can't speak for Durham at all but you are right (imho) to not be automatically accepting your Oxford offer, given your mental health issues. Oxford isn't always the most accommodating uni for those who struggle with mental health
so you are right to question whether it is for you. English is a particularly fast-paced course
My advice to everyone who has an Oxford offer but has mental health issues is to carefully weigh up the disability provisions from each uni you have an offer from, including Oxford. (Mental health issues qualify under the Equality Act 2010 as a disability and you will be recognised as such
) Find out everything you possibly can about what support you would get. I would pay particular emphasis to exam arrangements/reasonable adjustments, as these can be quite different depending what uni you're at. For example, when I was at Oxford (admittedly, 10 years ago, but things don't change that fast in Oxford!) and was in a massive psychotic episode, I was told that my mental health difficulties could not be taken into consideration when marking my exams
Consequently I graduated with a 2.2. That wasn't entirely Oxford's fault but certainly the support I would have wanted or expected (had I been a tad more lucid) was lacking
I can't speak for the undergrad experience at RHUL but I am doing a PhD there and am registered with their Disability and Dyslexia Service. Unfortunately our Mental Health Adviser is leaving in a few weeks' time but she should be replaced by September, should you decide to firm Royal Holloway. They are creating some new roles specifically relating to mental health (I forget the exact title but it's a kinda liaison service between the DDS and the Health Centre, which is the GP service on campus) and the ladies in the DDS office are very lovely
Do feel free to ask here or PM me if you have specific questions. Good luck in making a decision. You most certainly would NOT be a fool to turn down Oxford - your welfare and your life is far more important. In any case, Oxford is far from the be-all-and-end-all